A flexible safety protection device for welding on a steel bridge over a road ramp and its construction method

Abstract

This invention relates to a flexible safety protection device for welding steel bridges on road ramps, comprising an inner section of a steel box girder, an outer section of a steel box girder, and cantilever arms connecting them on both sides. These are installed on two piers, with supporting towers on the outside of the piers. A longitudinal weld is formed between the inner and outer sections of the steel box girder. A flexible protection device is installed below the longitudinal weld. The position of the flexible protection device is adjusted and fixed by steel wire ropes installed on both sides, catching any fasteners that accidentally detach from the longitudinal weld. This invention provides a flexible protection method for welding longitudinal seams on ramp steel bridges above normally open roads, ensuring the normal and safe passage of vehicles on existing roads.

Description

Technical Field

[0001] This invention relates to the field of steel box girder ramp bridge construction technology, specifically to a welded flexible safety protection device and construction method for cross-road ramp steel bridges. Background Technology

[0002] Due to limitations in transport width and crane lifting capacity, the steel box girders for ramp bridges need to be hoisted in sections along the longitudinal direction and then welded together at high altitude. When constructing across existing roads, conventional practices involve erecting protective sheds, scaffolding safety platforms, or suspended steel platforms at the base of the steel bridge. However, the erection and dismantling of these scaffolding protective sheds, scaffolding safety platforms, and suspended steel platforms all impede normal vehicle traffic.

[0003] Searching using the keywords "flexible safety protection for steel box girder welding" revealed: ① A formwork system and construction method for steel box-concrete composite beam bridge deck, publication number CN112832137A; ② A safety protection device suitable for welding the bottom plate of steel box girders, publication number CN217529704U; Searching using the keywords "welding for steel box girder welding" revealed: ③ A weld protection device for steel box girders, publication number CN205173953U; ① is a formwork system and construction method for steel box-concrete composite beam bridge deck, not a welding protection method; ② and ③ are welding funnels suitable for welding the bottom plate of steel box girders, both using magnetic fixation, belonging to rigid protection. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provide a flexible safety protection device and construction method for welding steel bridges over road ramps, which does not affect the normal and safe passage of road vehicles.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows: A flexible safety protection device for welding steel bridges crossing ramps includes an inner section of a steel box girder, an outer section of a steel box girder, and cantilever arms connecting them on both sides. These are installed on two piers, and a support tower is provided on the outside of the piers. There is a longitudinal weld between the inner and outer sections of the steel box girder. The device is characterized by: a flexible protection is provided at the bottom of the longitudinal weld, and the position is adjusted and fixed by steel wire ropes set on both sides of the flexible protection to catch fasteners that accidentally fall off from the longitudinal weld.

[0006] The aforementioned flexible safety protection device for welded steel bridges on road ramps is characterized in that: several temporary guardrail posts are respectively provided on the upper part of both sides of the cantilever arm, a kick plate is horizontally provided at the bottom of the several temporary guardrail posts, and safety steel wire ropes are connected between the several temporary guardrail posts; an arc-shaped round tube rigid slide is fixedly provided on the outside of the temporary guardrail posts, and the arc-shaped round tube rigid slide and the temporary guardrail posts are connected by connectors. The top of the support tower is equipped with a crossbeam, and two flexible steel wire rope slides are stretched laterally from the crossbeam; ceramic pads are provided at the bottom of the longitudinal weld; the flexible protection is made by weaving flexible protective steel wire rope, and its two ends are connected to the flexible steel wire rope slides by shackles. The two flexible steel wire rope slides are then connected to the steel wire ropes by shackles, and the two ends of the steel wire ropes are fixed to the rigid arc-shaped tube slides by shackles.

[0007] The construction method of the flexible safety protection device for welding steel bridges over road ramps is characterized by: The steel box girder and cantilever arm of the ramp bridge under construction have been hoisted into place and placed on the support towers and piers at both ends. The longitudinal welds between the inner and outer sections of the bridge steel box girder are fitted with ceramic gaskets at the bottom. Two flexible steel wire rope slides are installed at the top crossbeam of the support tower; A rigid arc-shaped tube slide is fixed to the outside of the temporary guardrail posts on both sides of the ramp bridge using connectors; The temporary railings on both sides of the ramp bridge are equipped with two safety ropes and kickboards; Flexible protective measures are woven on the ground using flexible protective steel wire ropes; The flexible protection consists of flexible protective steel wire rope, fireproof cloth, and asbestos blanket; The flexible protection is fixed to the flexible sliding track at the bottom of the ramp bridge on both sides by snap rings; The flexible slide at the bottom of the ramp bridge is fixed to the rigid slide by shackles and steel wire ropes.

[0008] The beneficial effects of this invention are as follows: Compared with prior art documents ② and ③, this application also pertains to welding fire protection, but this application adopts a wire rope net-type fireproof and fall-prevention method, which is a flexible protection method. The translation and adjustment process does not affect the traffic of vehicles on the existing road below. The entire structure is ingeniously designed, the principle is simple, and it meets the needs of actual construction. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 A schematic diagram showing the installation of flexible protective measures on one side of a cross-road ramp bridge.

[0010] Figure 2 A schematic diagram showing the longitudinal installation of flexible protective welding for a cross-road ramp bridge.

[0011] Figure 3 for Figure 2 Schematic diagram of the AA direction.

[0012] Figure 4 A schematic diagram showing the lateral adjustment of the welded flexible protective structure for the overpass ramp bridge.

[0013] Figure 5 for Figure 4 Diagram of the BB direction. Detailed Implementation

[0014] like Figure 1-5 As shown: A flexible safety protection device for welding steel bridges crossing ramps includes an inner section 1 of the steel box girder, an outer section 2 of the steel box girder, and cantilever arms 3 connecting them on both sides. They are installed on two piers. A support tower 14 is provided on the outside of the piers 15. There is a longitudinal weld 4 between the inner section and the outer section of the steel box girder. A flexible protection is set at the bottom of the longitudinal weld. The position is adjusted and fixed by steel wire ropes set on both sides of the flexible protection to catch fasteners that accidentally fall off from the longitudinal weld.

[0015] Furthermore, several temporary guardrail posts 6 are respectively provided on the upper part of both sides of the cantilever arm, and a kick plate 62 is provided horizontally at the bottom of the temporary guardrail posts. Safety steel wire ropes 61 are connected between the temporary guardrail posts. An arc-shaped round tube rigid slide 8 is fixed on the outside of the temporary guardrail posts, and the arc-shaped round tube rigid slide and the temporary guardrail posts are connected by connectors 7. The top of the support tower is provided with a crossbeam 141, and two flexible steel wire rope slides 11 are stretched horizontally on the crossbeam; a ceramic pad 5 is provided at the bottom of the longitudinal weld; the flexible protection 13 is woven by the flexible protection steel wire rope 12, and its two ends are connected to the flexible steel wire rope slides by the retaining rings 9. The two flexible steel wire rope slides are then connected to the steel wire rope 10 by the retaining rings 9 respectively, and the two ends of the steel wire rope are fixed to the arc-shaped round tube rigid slide by the retaining rings 9.

[0016] A construction method for a welded flexible safety protection device for a steel bridge over a road ramp: The steel box girder of the ramp bridge under construction and the cantilever 3 were hoisted into place and placed on the support towers 14 and piers 15 at both ends; The longitudinal weld 4 between the inner bridge section 1 and the outer bridge section 2 of the steel box girder is bonded with a ceramic gasket 5 at the bottom. At the top crossbeam 141 of the supporting tower, two flexible steel wire rope slides 8 are installed; An arc-shaped rigid slide rail 8 is fixed to the outside of the temporary guardrail posts 6 on both sides of the ramp bridge via connectors 7; The temporary railings on both sides of the ramp bridge are equipped with two safety ropes 61 and kickboards 62. Flexible protective measures 13 are woven on the ground using flexible protective steel wire ropes 12; The flexible protection 13 is composed of flexible protective steel wire rope 12, fireproof cloth, and asbestos blanket; The flexible protection 13 is fixed to the flexible slide rail 11 at the bottom of the ramp bridge by the retaining rings 9 on both sides; The flexible slide 11 at the bottom of the ramp bridge is fixed to the rigid slide 8 by a retaining ring 9 and a steel wire rope 10.

[0017] The specific implementation method is as follows: Flexible protection 13 is installed on one side of the ramp bridge. The flexible protection 13 is then unfolded and horizontally pulled across the road to the other end via the rigid slide rail 8 on the outside of the temporary guardrail 6.

[0018] Then, adjust the position of the flexible protection 13 by adjusting the length of the steel wire rope 10 to ensure that it catches and protects the longitudinal weld seam 5 of the steel box girder, and ensures that if the ceramic pad 5 at the bottom falls off, it will fall directly onto the flexible protection 3, ensuring that vehicles on the road below can pass normally.

[0019] When removing the flexible protective shield 13, simply pull it back and place it on the ground.

[0020] This invention is mainly used in the construction of steel box girders for ramp bridges above existing highways. It can catch spatter at the bottom of the longitudinal welds of the steel box girder and can also catch detached ceramic pads. During the flexible protection installation, deployment and retraction process, it does not affect the normal traffic of the existing highway below.

Claims

1. A flexible safety protection device for welded steel bridges crossing ramps, comprising an inner section of a steel box girder, an outer section of a steel box girder, and cantilever arms connecting them on both sides, which are installed on two piers. Support towers are provided outside the piers. A longitudinal weld is present between the inner and outer sections of the steel box girder, characterized in that: A flexible shield is installed at the bottom of the longitudinal weld. The position of the shield is adjusted and fixed by steel wire ropes on both sides of the flexible shield to catch fasteners that accidentally fall out of the longitudinal weld. Several temporary guardrail posts are installed on the upper part of both sides of the cantilever arm. A kick plate is installed horizontally at the bottom of each temporary guardrail post. Safety steel wire ropes are connected between the temporary guardrail posts. An arc-shaped rigid slide is fixed on the outside of the temporary guardrail posts. The arc-shaped rigid slide and the temporary guardrail posts are connected by connectors. The top of the support tower is equipped with a crossbeam, and two flexible steel wire rope slides are stretched laterally from the crossbeam; ceramic pads are provided at the bottom of the longitudinal weld; the flexible protection is made by weaving flexible protective steel wire rope, and its two ends are connected to the flexible steel wire rope slides by shackles. The two flexible steel wire rope slides are then connected to the steel wire ropes by shackles, and the two ends of the steel wire ropes are fixed to the rigid arc-shaped tube slides by shackles.

2. The construction method of a welded flexible safety protection device for a steel bridge over a road ramp according to claim 1, characterized in that: The steel box girder and cantilever arm of the ramp bridge under construction have been hoisted into place and placed on the support towers and piers at both ends. The longitudinal welds between the inner and outer sections of the bridge steel box girder are fitted with ceramic gaskets at the bottom. Two flexible steel wire rope slides are installed at the top crossbeam of the support tower; A rigid arc-shaped tube slide is fixed to the outside of the temporary guardrail posts on both sides of the ramp bridge using connectors; The temporary railings on both sides of the ramp bridge are equipped with two safety ropes and kickboards; Flexible protective measures are woven on the ground using flexible protective steel wire ropes; The flexible protection consists of flexible protective steel wire rope, fireproof cloth, and asbestos blanket; The flexible protection is fixed to the flexible sliding track at the bottom of the ramp bridge on both sides by snap rings; The flexible slide at the bottom of the ramp bridge is fixed to the rigid slide by shackles and steel wire ropes.

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